Russia’s Investigative Committee said it had launched probes into three separate attacks against police, including a failed suicide bombing.

In the first attack on Monday morning, two men entered the district police department in the town of Shali and wounded a pair of policemen with knives, investigators said in a statement.

The two assailants were shot dead, Chechnya’s interior ministry said.

In the village of Mesker-Yurt north of Shali, a man with a backpack attempted a suicide bombing near a police post but “police officers and civilians were not harmed by the blast,” the Investigative Committee said. The third incident occurred on the outskirts of the Chechen capital Grozny, where a man attempted to run over a traffic policeman in his car and subsequently hit two more officers as he was chased. “The criminals were neutralised,” the Investigative Committee said.